Melted peaks

Figure 5.2. Printing
Upside down

If the last layer ends in a peak then it can happen that the
filament does not cool down fast enough. There are options to
slow down printing when the area gets small and turn the fan
on. But this works just down to a certain area, but there is
always the hot extruder beneath the small area. An other way
out is printing multiple parts at the same time or flip the
part and use supporting material as a brim.